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/*
* Copyright 2012, Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.android.tools.smali.dexlib2.dexbacked.instruction;
import com.android.tools.smali.dexlib2.Opcode;
import com.android.tools.smali.dexlib2.iface.instruction.formats.ArrayPayload;
import com.android.tools.smali.util.ExceptionWithContext;
import com.android.tools.smali.dexlib2.dexbacked.DexBackedDexFile;
import com.android.tools.smali.dexlib2.dexbacked.util.FixedSizeList;
import javax.annotation.Nonnull;
import java.util.List;
import java.util.Collections;
public class DexBackedArrayPayload extends DexBackedInstruction implements ArrayPayload {
public static final Opcode OPCODE = Opcode.ARRAY_PAYLOAD;
public final int elementWidth;
public final int elementCount;
private static final int ELEMENT_WIDTH_OFFSET = 2;
private static final int ELEMENT_COUNT_OFFSET = 4;
private static final int ELEMENTS_OFFSET = 8;
public DexBackedArrayPayload(@Nonnull DexBackedDexFile dexFile,
int instructionStart) {
super(dexFile, OPCODE, instructionStart);
int localElementWidth = dexFile.getDataBuffer().readUshort(instructionStart + ELEMENT_WIDTH_OFFSET);
if (localElementWidth == 0) {
elementWidth = 1;
elementCount = 0;
} else {
elementWidth = localElementWidth;
elementCount = dexFile.getDataBuffer().readSmallUint(instructionStart + ELEMENT_COUNT_OFFSET);
if (((long) elementWidth) * elementCount > Integer.MAX_VALUE) {
throw new ExceptionWithContext("Invalid array-payload instruction: element width*count overflows");
}
}
}
@Override public int getElementWidth() { return elementWidth; }
@Nonnull
@Override
public List<Number> getArrayElements() {
final int elementsStart = instructionStart + ELEMENTS_OFFSET;
abstract class ReturnedList extends FixedSizeList<Number> {
@Override public int size() { return elementCount; }
}
if (elementCount == 0) {
return Collections.unmodifiableList(List.of());
}
switch (elementWidth) {
case 1:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.getDataBuffer().readByte(elementsStart + index);
}
};
case 2:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.getDataBuffer().readShort(elementsStart + index*2);
}
};
case 4:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.getDataBuffer().readInt(elementsStart + index*4);
}
};
case 8:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.getDataBuffer().readLong(elementsStart + index*8);
}
};
default:
throw new ExceptionWithContext("Invalid element width: %d", elementWidth);
}
}
@Override
public int getCodeUnits() {
return 4 + (elementWidth*elementCount + 1) / 2;
}
}
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